docs: def set_dchans(self, dchans=None, method='set'):
          """ Set (or update) the dchans dict
  
          dchans is a dict of np.ndarrays of len() = self.nch containing
          channel-specific information
  
          Use the kwarg 'method' to set / update the dict
  
          """
          assert method in ['set','update']
          dchans = self._checkformat_inputs_dchans(dchans=dchans)
          if method == 'set':
              self._dchans = dchans
          else:
              self._dchans.update(dchans)